DSpat (version 0.1.6)

weeds.obs: Observations from Dubbo weed data

Description

Observed devils claw in a farming paddock from eight 150m wide transects (75m each side). These are the records from weeds that were seen.

Usage

data(weeds.obs)

Format

A data frame with 479 observations on the following 4 variables.

label

Label of the transect 1 to 8

x

x coordinate in the farming paddock

y

y coordinate created randomly for the data

distance

perpendicular distance from line to weed

Details

These are the data constructed from weeds that were provided by Melville and Welsh (see reference below) that were used in the Biometrics paper on distance sampling.

The code used to create the data from weeds was as follows:

data(weeds.all)
weeds.obs=weeds.all[weeds.all$Seen==1,]
weeds.obs$Seen=NULL
save(weeds.obs,file="weeds.obs.rda")

References

Melville, G. J., and A. H. Welsh. 2001. Line transect sampling in small regions. Biometrics 57:1130-1137.